Coolbooks - Does it run when closed / not run on startup?

Does coolbooks keep my MBP running with the same steppings/voltages I set in it if I close it? Or does it default back to stock?

I set up my stable steppings and voltages, do I have to run coolbooks each tie I reboot or turn the MBP on? or are the steppings and voltages, once saved once, stored in some low level area and used until changed by me in coolbooks again?

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